Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nippon Steel Corp
Original Assignee
Nippon Steel Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nippon Steel CorpfiledCriticalNippon Steel Corp
Priority to JP15693180ApriorityCriticalpatent/JPS56139659A/en
Publication of JPS56139659ApublicationCriticalpatent/JPS56139659A/en
Publication of JPS5757947B2publicationCriticalpatent/JPS5757947B2/ja
Heat Treatment Of Strip Materials And Filament Materials
(AREA)
Abstract
PURPOSE: To enhance the tensile strength of a low-carbon boron steel contg. Si, Mn and Cr without causing quenching crack by directly quenching the steel to form a martensite structure immediately after hot rolling the steel into a wire rod.
CONSTITUTION: A low-carbon boron steel is hot rolled consisting of 0.06W0.26% C, 0.15W0.35% Si, 0.50W <0.80% Mn, 0.15W0.40% Cr, 0.0003W0.005% B and the balance Fe with inevitable impurities. The resulting wire rod after finish rolling is precooled and coiled with quenching to obtain a steel wire having a uniform martensite structure free from soft spots over the full length without causing quenching crack. This low-carbon high-tensile steel wire has ≥100kg/mm2 tensile strength and superior ductility.
Production of high strength low yield ratio high ductility composite structure steel plate of superior workability and high artificial age hardening characteristic after working